Swimming Pools & Spas in Longmont, CO: What Residents Actually Need to Know

Longmont maintains 106 local ordinances across all categories, and 4 of those deal specifically with swimming pools & spas. Here is a breakdown of what the city actually requires, what is prohibited, and where Longmont falls on the strict-to-permissive spectrum compared to other cities.

Pool Permits

Longmont requires a building permit for any swimming pool (in-ground or above-ground over 24 inches deep), spa, or hot tub. Permits are issued by Building Services at 385 Kimbark Street under the city's adopted 2021 International Codes (effective January 1, 2022). Pool barriers, electrical bonding, and gas/plumbing all require inspection.

Key details: Permit Required: All swimming pools over 24 in deep; all spas and hot tubs. Adopted Code: 2021 IBC / IRC / IFC (effective Jan. 1, 2022). Permit Issuer: Building Inspection Division, 385 Kimbark St.. Phone: (303) 651-8332. Online Portal: https://aca.ci.longmont.co.us/CitizenAccess/.

Installing a pool, spa, or hot tub without a permit can trigger stop-work orders, double permit fees, required exposure/removal of buried work for inspection, and code enforcement action. Filling and using a pool before final inspection passes is a violation and creates serious liability if a child is injured.

This is not one of those rules that cities tend to ignore. Longmont actively enforces its pool permits requirements.

Safety Rules

Beyond the 4-foot barrier rule in LMC 15.05.100, Longmont enforces the 2021 IRC Appendix V and 2021 IBC pool-safety provisions: anti-entrapment drain covers compliant with the federal Virginia Graeme Baker Pool & Spa Safety Act, equipotential electrical bonding around the pool shell, alarms on dwelling doors that open directly to the pool area, and required final inspection before filling the pool.

Key details: Adopted Code: 2021 IRC App. V / 2021 IBC / 2020 NEC (Jan. 1, 2022). Barrier Height: At least 48 inches. Drain Cover Standard: VGB Act / ANSI-APSP-16 anti-entrapment. Electrical Bonding: NEC Article 680 equipotential grid required. GFCI: Required on all pool circuits and receptacles within 20 ft.

Filling or operating a pool before final inspection, disabling door alarms or gate latches, removing anti-entrapment drain covers, or installing pool electrical without bonding can result in stop-work orders, code enforcement citations, civil liability, and (for negligent failures resulting in injury) potential criminal charges under Colorado child-endangerment laws.

Compared to other cities, Longmont takes a harder line on safety rules. The enforcement and penalty structure reflects that.

Fencing Requirements

Longmont requires every pool deeper than 24 inches and every hot tub or spa to be enclosed by a barrier at least 4 feet (48 inches) tall, with no opening larger than 4 inches, per LMC 15.05.100 and the adopted 2021 IRC Appendix V. Gates must self-close and self-latch, opening outward away from the pool, with the latch release at least 54 inches high.

Key details: Minimum Barrier Height: 4 feet / 48 inches (LMC + 2021 IRC App. V). Max Opening: Less than 4-inch sphere. Bottom Clearance: Max 2 inches above grade (4 in over solid surface). Gate: Self-closing, self-latching, opens outward away from pool. Latch Height: At least 54 inches above bottom of gate.

A pool will fail final inspection and may not be filled or used until a compliant barrier and gate hardware are installed. Disabling or propping open a self-latching gate, or removing an alarm on a dwelling door, is a code violation creating serious liability.

Compared to other cities, Longmont takes a harder line on fencing requirements. The enforcement and penalty structure reflects that.

Hot Tub Rules

Hot tubs and spas require a building permit in Longmont and must be enclosed by a 4-foot fence with openings under 4 inches per LMC 15.05.100 - OR they may use a lockable safety cover capable of supporting at least 150 pounds, which must be locked when the spa or hot tub is not in use. Electrical work must comply with the adopted 2020 NEC Article 680 (GFCI protection and bonding).

Key details: Permit Required: Yes - hot tubs/spas classified as 'appliances' requiring permit. Barrier Option 1: 4-foot fence with less-than-4-inch openings (LMC 15.05.100). Barrier Option 2: Lockable cover supporting at least 150 lb, locked when not in use. Cover Standard: ASTM F1346 (2021 IRC App. V). Electrical Code: 2020 NEC Article 680 - GFCI + bonding.

Installing a hot tub or spa without a permit, or operating one without either a 4-foot fence or a locked-and-rated safety cover, is a code violation. The city can require correction, charge re-inspection fees, and pursue code enforcement. Failing to lock the cover when the tub is unattended creates serious child-drowning liability.

This is one of the stricter rules in Longmont's municipal code. If you are unsure whether your situation complies, it is worth checking with the city before proceeding.

The Bottom Line

Longmont is tougher than many cities when it comes to swimming pools & spas. Out of the 4 rules covered here, 4 are rated strict. If you are a homeowner, renter, or business owner in Longmont, take the time to understand these requirements before they become a problem. Most violations come with fines, and some repeat violations can escalate.

This guide is based on Longmont's current municipal code. Local rules can and do change, so check the individual ordinance pages for the latest details, penalties, and FAQs.